Ion Separation by Hyperfìltration Through Charged Membranes. I. Calculation Based on TMS Model

Erica Hoffer, Ora Kedem

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Salt rejections of copper chloride and of hydrochloric acid were calculated for the hyperfìltration of mixed solutions. The membrane model chosen was the fixed charge model described by Teorell and by Meyer and Sievers. Calculation was based on the flow equations of each electroneutral species. Concentration gradients of these species were numerically integrated across the membrane, and a numerical optimization method was used to evaluate rejections. Because of the enrichment of acid and dilution of copper in the product, a considerable separation between the two cations is to be expected. In many cases, separation was larger than the gap between the rejections during hyperfìltration of separate solutions. The difference between hyperfìltration performance of mixtures and separate solutions can be explained in terms of different ion distributions at the feed boundary and of the interdependence of streaming potentials. Exclusion at the feed boundary and concentration profiles during hyperfìltration were evaluated.

Original languageEnglish
Pages (from-to)221-225
Number of pages5
JournalIndustrial and Engineering Chemistry Process Design and Development
Volume11
Issue number2
DOIs
StatePublished - 1 Apr 1972
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Engineering
  • Industrial and Manufacturing Engineering

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